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Protein Intake Calculator: Daily Protein Needs by Goal
A fast, science-backed daily protein intake calculator that tells you exactly how many grams of protein you need each day based on body weight, fitness goal, and activity level.
Calculate protein intake for muscle gain, weight loss, or maintenance, accurate for men, women, and athletes.
What's your name?
We'll personalize your plan with it.
Select your gender
This helps tailor metabolism estimates.
How old are you?
Age affects calorie and protein needs.
What's your height?
Used to estimate body composition.
What's your weight?
Drives the protein and calorie calculation.
What are you trying to achieve with protein?
Select every reason that matters to you — your plan adapts to all of them.
How active is your day?
Outside of structured workouts.
How do you like to train?
Pick every style that's part of your week.
What's your diet style?
We'll match your protein sources to your eating pattern.
Here's your daily plan
Macro Distribution
Best protein sources for your diet
Research-backed picks. Mix and match to hit your daily target.
This calculator provides general estimates based on standard fitness formulas. Individual needs may vary. Consult a professional for personalized advice.
What Is a Protein Intake Calculator?
A protein intake calculator is a free tool that estimates how many grams of protein you need per day based on your body weight, fitness goal, and activity level. It gives personalised targets for muscle gain, weight loss, and maintenance, usually between 0.8 g and 2.4 g of protein per kilogram of body weight, depending on your goal.
How the Protein Intake Calculator Works
Calculating protein intake takes just four quick steps. Here’s how the tool turns your basic info into a personalised daily protein target.
Enter Your Weight
Type your body weight in kilograms or pounds, the calculator handles both units automatically.
Select Your Goal
Choose muscle gain, weight loss, maintenance, or recomposition so the formula matches your aim.
Choose Activity Level
From sedentary to highly active, your training load directly influences your protein requirement.
Get Your Daily Target
Receive your recommended daily protein intake in grams, with a healthy range to aim for.
How to Calculate Protein Intake (Step-by-Step Formula)
The simplest way to calculate your daily protein intake is to multiply your body weight in kilograms by a protein factor that matches your goal. This approach, used by sports nutritionists worldwide, is more accurate than percentage-based methods because it scales with your actual body size.
Universal Protein Formula
Daily protein (g) = Body weight (kg) × Protein factor (g/kg)
Protein g/day = Weight kg × Goal Factor
Protein Intake Per Kg of Body Weight
Research from the International Society of Sports Nutrition recommends the following protein-per-kg ranges. These ranges sit at the core of every accurate protein intake calculator:
- Sedentary adults: 0.8 g per kg body weight
- General fitness: 1.2–1.6 g per kg
- Muscle gain (lifters): 1.6–2.2 g per kg
- Fat loss in a defitic: 1.8–2.4 g per kg
- Endurance athletes: 1.4–1.8 g per kg
- Strength athletes: 1.7–2.2 g per kg
Worked Examples (Metric & Imperial)
Metric Example: 70 kg adult
Goal: Muscle gain at 1.8 g/kg
70 × 1.8 = 126 g of protein per day
Imperial Example: 165 lb adult
Convert: 165 ÷ 2.205 = 74.8 kg
Goal: Fat loss at 2.0 g/kg
74.8 × 2.0 = 150 g of protein per day
Muscle Gain Example: 80 kg lifter
Aggressive bulk at 2.2 g/kg
80 × 2.2 = 176 g of protein per day, split across 4–5 meals.
Female Cutter: 60 kg woman
Calorie deficit at 2.0 g/kg
60 × 2.0 = 120 g of protein per day to protect lean tissue.
Protein Intake to Build Muscle
To build muscle, aim for the upper end of the range, 1.6 to 2.2 grams of protein per kilogram of body weight. Pair this with a slight calorie surplus (200–400 kcal above maintenance) and progressive resistance training. Spread your intake across 3–5 meals containing 25–40 g of protein each to maximise muscle protein synthesis throughout the day.
Protein Intake for Weight Loss
During fat loss, protein needs increase because your body relies on it to protect lean muscle in a calorie deficit. A protein intake calculator for weight loss usually returns 1.8–2.4 g/kg, which also boosts satiety and the thermic effect of food, meaning you burn slightly more calories digesting protein than carbs or fats.
Athletes & Highly Active Individuals
Endurance athletes need protein to repair muscle damage from long sessions (1.4–1.8 g/kg), while strength and power athletes benefit from higher intakes (1.7–2.2 g/kg). Anyone training twice a day or competing should sit at the upper end and consider 25–30 g of protein within 1–2 hours after training.
Protein Requirements by Goal
Your ideal protein intake depends on what you’re trying to achieve. Here’s how recommended ranges shift across the six most common goals.
Weight Loss
Higher protein during a calorie deficit protects lean muscle, increases satiety, and prevents the metabolic slowdown that comes with rapid weight loss.
Muscle Gain
Supports muscle protein synthesis when combined with progressive resistance training and a small calorie surplus. Spread evenly across the day for best results.
Body Recomposition
Building muscle while losing fat at maintenance calories requires consistent high-protein intake plus strength training 3–5 times per week.
Athletes
Endurance and strength athletes need extra protein for muscle repair, glycogen replenishment, and faster recovery between sessions.
Women
Active women, especially during fat loss or strength training phases, benefit from protein at the upper end to preserve lean mass and support hormonal health.
Beginners
New trainees see strong results with moderate protein intake. As training volume increases, gradually push toward 1.6–2.0 g/kg over a few months.
Protein Requirements by Goal
Your ideal protein intake depends on what you’re trying to achieve. Here’s how recommended ranges shift across the six most common goals.
Chicken Breast
Lean, affordable, and packed with complete amino acids, a staple for muscle building.
Eggs
The gold-standard protein source with the highest biological value of any natural food.
Fish (Salmon)
Rich in protein plus omega-3 fatty acids that aid recovery and reduce inflammation.
Greek Yogurt
High-protein, low-fat, and gut-friendly, perfect for breakfast or post-workout snacks.
Lentils
Top plant protein source loaded with fibre and iron, ideal for vegetarian muscle building.
Tofu
Complete plant protein that absorbs flavour easily, versatile for any meal.
Whey Protein
Fast-absorbing supplement that’s perfect post-workout to spike muscle protein synthesis.
Cottage Cheese
Slow-digesting casein protein, eat before bed to support overnight muscle recovery.
- Eating Too Little Protein
Sticking to the bare minimum (0.8 g/kg) is enough to survive, not enough to build muscle, lose fat, or recover from training. Active people need 1.4 g/kg or more.
- Relying Only on Supplements
Whey shakes are convenient, but whole foods deliver more micronutrients and satiety. Aim to hit 70–80% of your protein from real food.
- Not Spreading Protein Across the Day
Eating 150 g in two meals is less effective than 30–40 g across four meals. Even distribution maximises muscle protein synthesis.
- Ignoring Total Calorie Intake
Protein doesn’t override energy balance. To build muscle you still need a small surplus; to lose fat you need a deficit, protein simply protects muscle in the process.
- Unrealistic Bulking Targets
Eating 3 g/kg or more shows no extra muscle benefit over 2.2 g/kg and may displace carbs and fats needed for performance.
- Forgetting to Recalculate
Your protein needs change as your weight changes. Recalculate every 3–4 kg of weight loss or gain to stay on target.
Common BMR Mistakes
Six BMR calculation mistakes that derail diet and fitness plans, avoid them all.
Frequently Asked Questions
Quick, evidence-based answers to the most common questions about calculating daily protein intake.
How do I calculate my protein intake?
To calculate your daily protein intake, multiply your body weight in kilograms by your protein factor (0.8 g/kg for sedentary, 1.6–2.2 g/kg for muscle gain, 1.8–2.4 g/kg for weight loss). A 70 kg adult building muscle needs roughly 112–154 g of protein per day. Using the calculator above automates this in seconds.
How much protein do I need to build muscle?
For muscle gain, aim for 1.6 to 2.2 grams of protein per kilogram of body weight per day. A 75 kg lifter should target 120–165 g daily, split across 3–5 meals of 25–40 g each. Combine this with progressive overload training and a small calorie surplus.
How much protein do I need for weight loss?
During a calorie deficit, eat 1.8–2.4 g of protein per kilogram of body weight to preserve lean muscle and stay full longer. A 70 kg dieter should target around 126–168 g per day. Higher protein in a deficit is one of the most evidence-backed strategies for losing fat without losing muscle.
What is the recommended protein intake for women?
Active women generally need 1.4–2.0 g of protein per kilogram of body weight. A 60 kg woman who exercises regularly should aim for 84–120 g of protein per day. Slightly more is helpful during fat loss or strength training phases. A female protein intake calculator gives a precise number based on your weight and goal.
Is 100 grams of protein a day enough?
100 g of protein per day is enough for sedentary adults up to roughly 80–90 kg. Active people, lifters, or anyone in a calorie deficit usually need 120–180 g per day to support muscle recovery and growth. Use the calculator to see your exact number.
Can I eat too much protein?
Yes. Intakes above 3.5 g/kg offer no additional muscle-building benefit for most people and may strain digestion or displace carbs and fats needed for energy. Stay within 0.8–2.4 g/kg unless directed by a sports dietitian.
Should I count protein in grams or percentage of calories?
Always count protein in grams per kilogram of body weight. Percentage targets fluctuate with calorie intake, so a gram-based goal is much more accurate for muscle gain, fat loss, and recovery — and it’s what every reliable protein intake calculator uses.
How often should I eat protein during the day?
Spread your daily protein across 3–5 meals containing 25–40 g each. Even distribution maximises muscle protein synthesis better than eating most of your protein in one large meal. Add a protein source to every meal and snack.
Is plant protein as good as animal protein?
Plant proteins fully support muscle growth when total intake is adequate and sources are varied. Lifters relying mainly on plants may benefit from slightly higher targets (around 1.8–2.4 g/kg) and complete combinations like rice with lentils or pea with hemp protein.
Does this calculator work for both metric and imperial units?
Yes. The protein intake calculator accepts both kilograms and pounds. To convert manually, divide pounds by 2.205 to get kilograms, or multiply kilograms by 2.205 to get pounds. The tool handles the math for you automatically.
When is the best time to take protein?
The total daily amount matters most, but eating 25–40 g of protein within 1–2 hours after training optimises muscle repair. Including protein at breakfast also kick-starts muscle protein synthesis after the overnight fast.
Do older adults need more protein?
Yes. Adults over 60 are more resistant to the muscle-building effects of protein, so 1.2–2.0 g/kg is recommended to prevent sarcopenia (age-related muscle loss). Pair adequate protein with resistance training 2–3 times per week.
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